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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (C) 2012 Avionic Design GmbH
   4 * Copyright (C) 2012-2016 NVIDIA CORPORATION.  All rights reserved.
   5 */
   6
   7#include <linux/bitops.h>
   8#include <linux/host1x.h>
   9#include <linux/idr.h>
  10#include <linux/iommu.h>
  11#include <linux/module.h>
  12#include <linux/platform_device.h>
  13
  14#include <drm/drm_aperture.h>
  15#include <drm/drm_atomic.h>
  16#include <drm/drm_atomic_helper.h>
  17#include <drm/drm_debugfs.h>
  18#include <drm/drm_drv.h>
  19#include <drm/drm_fourcc.h>
  20#include <drm/drm_ioctl.h>
  21#include <drm/drm_prime.h>
  22#include <drm/drm_vblank.h>
  23
  24#include "drm.h"
  25#include "gem.h"
  26
  27#define DRIVER_NAME "tegra"
  28#define DRIVER_DESC "NVIDIA Tegra graphics"
  29#define DRIVER_DATE "20120330"
  30#define DRIVER_MAJOR 0
  31#define DRIVER_MINOR 0
  32#define DRIVER_PATCHLEVEL 0
  33
  34#define CARVEOUT_SZ SZ_64M
  35#define CDMA_GATHER_FETCHES_MAX_NB 16383
  36
  37struct tegra_drm_file {
  38	struct idr contexts;
  39	struct mutex lock;
  40};
  41
  42static int tegra_atomic_check(struct drm_device *drm,
  43			      struct drm_atomic_state *state)
  44{
  45	int err;
  46
  47	err = drm_atomic_helper_check(drm, state);
  48	if (err < 0)
  49		return err;
  50
  51	return tegra_display_hub_atomic_check(drm, state);
  52}
  53
  54static const struct drm_mode_config_funcs tegra_drm_mode_config_funcs = {
  55	.fb_create = tegra_fb_create,
  56#ifdef CONFIG_DRM_FBDEV_EMULATION
  57	.output_poll_changed = drm_fb_helper_output_poll_changed,
  58#endif
  59	.atomic_check = tegra_atomic_check,
  60	.atomic_commit = drm_atomic_helper_commit,
  61};
  62
  63static void tegra_atomic_commit_tail(struct drm_atomic_state *old_state)
  64{
  65	struct drm_device *drm = old_state->dev;
  66	struct tegra_drm *tegra = drm->dev_private;
  67
  68	if (tegra->hub) {
  69		bool fence_cookie = dma_fence_begin_signalling();
  70
  71		drm_atomic_helper_commit_modeset_disables(drm, old_state);
  72		tegra_display_hub_atomic_commit(drm, old_state);
  73		drm_atomic_helper_commit_planes(drm, old_state, 0);
  74		drm_atomic_helper_commit_modeset_enables(drm, old_state);
  75		drm_atomic_helper_commit_hw_done(old_state);
  76		dma_fence_end_signalling(fence_cookie);
  77		drm_atomic_helper_wait_for_vblanks(drm, old_state);
  78		drm_atomic_helper_cleanup_planes(drm, old_state);
  79	} else {
  80		drm_atomic_helper_commit_tail_rpm(old_state);
  81	}
  82}
  83
  84static const struct drm_mode_config_helper_funcs
  85tegra_drm_mode_config_helpers = {
  86	.atomic_commit_tail = tegra_atomic_commit_tail,
  87};
  88
  89static int tegra_drm_open(struct drm_device *drm, struct drm_file *filp)
  90{
  91	struct tegra_drm_file *fpriv;
  92
  93	fpriv = kzalloc(sizeof(*fpriv), GFP_KERNEL);
  94	if (!fpriv)
  95		return -ENOMEM;
  96
  97	idr_init_base(&fpriv->contexts, 1);
  98	mutex_init(&fpriv->lock);
  99	filp->driver_priv = fpriv;
 100
 101	return 0;
 102}
 103
 104static void tegra_drm_context_free(struct tegra_drm_context *context)
 105{
 106	context->client->ops->close_channel(context);
 107	kfree(context);
 108}
 109
 110static struct host1x_bo *
 111host1x_bo_lookup(struct drm_file *file, u32 handle)
 112{
 113	struct drm_gem_object *gem;
 114	struct tegra_bo *bo;
 115
 116	gem = drm_gem_object_lookup(file, handle);
 117	if (!gem)
 118		return NULL;
 119
 120	bo = to_tegra_bo(gem);
 121	return &bo->base;
 122}
 123
 124static int host1x_reloc_copy_from_user(struct host1x_reloc *dest,
 125				       struct drm_tegra_reloc __user *src,
 126				       struct drm_device *drm,
 127				       struct drm_file *file)
 128{
 129	u32 cmdbuf, target;
 130	int err;
 131
 132	err = get_user(cmdbuf, &src->cmdbuf.handle);
 133	if (err < 0)
 134		return err;
 135
 136	err = get_user(dest->cmdbuf.offset, &src->cmdbuf.offset);
 137	if (err < 0)
 138		return err;
 139
 140	err = get_user(target, &src->target.handle);
 141	if (err < 0)
 142		return err;
 143
 144	err = get_user(dest->target.offset, &src->target.offset);
 145	if (err < 0)
 146		return err;
 147
 148	err = get_user(dest->shift, &src->shift);
 149	if (err < 0)
 150		return err;
 151
 152	dest->flags = HOST1X_RELOC_READ | HOST1X_RELOC_WRITE;
 153
 154	dest->cmdbuf.bo = host1x_bo_lookup(file, cmdbuf);
 155	if (!dest->cmdbuf.bo)
 156		return -ENOENT;
 157
 158	dest->target.bo = host1x_bo_lookup(file, target);
 159	if (!dest->target.bo)
 160		return -ENOENT;
 161
 162	return 0;
 163}
 164
 165int tegra_drm_submit(struct tegra_drm_context *context,
 166		     struct drm_tegra_submit *args, struct drm_device *drm,
 167		     struct drm_file *file)
 168{
 169	struct host1x_client *client = &context->client->base;
 170	unsigned int num_cmdbufs = args->num_cmdbufs;
 171	unsigned int num_relocs = args->num_relocs;
 172	struct drm_tegra_cmdbuf __user *user_cmdbufs;
 173	struct drm_tegra_reloc __user *user_relocs;
 174	struct drm_tegra_syncpt __user *user_syncpt;
 175	struct drm_tegra_syncpt syncpt;
 176	struct host1x *host1x = dev_get_drvdata(drm->dev->parent);
 177	struct drm_gem_object **refs;
 178	struct host1x_syncpt *sp = NULL;
 179	struct host1x_job *job;
 180	unsigned int num_refs;
 181	int err;
 182
 183	user_cmdbufs = u64_to_user_ptr(args->cmdbufs);
 184	user_relocs = u64_to_user_ptr(args->relocs);
 185	user_syncpt = u64_to_user_ptr(args->syncpts);
 186
 187	/* We don't yet support other than one syncpt_incr struct per submit */
 188	if (args->num_syncpts != 1)
 189		return -EINVAL;
 190
 191	/* We don't yet support waitchks */
 192	if (args->num_waitchks != 0)
 193		return -EINVAL;
 194
 195	job = host1x_job_alloc(context->channel, args->num_cmdbufs,
 196			       args->num_relocs);
 197	if (!job)
 198		return -ENOMEM;
 199
 200	job->num_relocs = args->num_relocs;
 201	job->client = client;
 202	job->class = client->class;
 203	job->serialize = true;
 204
 205	/*
 206	 * Track referenced BOs so that they can be unreferenced after the
 207	 * submission is complete.
 208	 */
 209	num_refs = num_cmdbufs + num_relocs * 2;
 210
 211	refs = kmalloc_array(num_refs, sizeof(*refs), GFP_KERNEL);
 212	if (!refs) {
 213		err = -ENOMEM;
 214		goto put;
 215	}
 216
 217	/* reuse as an iterator later */
 218	num_refs = 0;
 219
 220	while (num_cmdbufs) {
 221		struct drm_tegra_cmdbuf cmdbuf;
 222		struct host1x_bo *bo;
 223		struct tegra_bo *obj;
 224		u64 offset;
 225
 226		if (copy_from_user(&cmdbuf, user_cmdbufs, sizeof(cmdbuf))) {
 227			err = -EFAULT;
 228			goto fail;
 229		}
 230
 231		/*
 232		 * The maximum number of CDMA gather fetches is 16383, a higher
 233		 * value means the words count is malformed.
 234		 */
 235		if (cmdbuf.words > CDMA_GATHER_FETCHES_MAX_NB) {
 236			err = -EINVAL;
 237			goto fail;
 238		}
 239
 240		bo = host1x_bo_lookup(file, cmdbuf.handle);
 241		if (!bo) {
 242			err = -ENOENT;
 243			goto fail;
 244		}
 245
 246		offset = (u64)cmdbuf.offset + (u64)cmdbuf.words * sizeof(u32);
 247		obj = host1x_to_tegra_bo(bo);
 248		refs[num_refs++] = &obj->gem;
 249
 250		/*
 251		 * Gather buffer base address must be 4-bytes aligned,
 252		 * unaligned offset is malformed and cause commands stream
 253		 * corruption on the buffer address relocation.
 254		 */
 255		if (offset & 3 || offset > obj->gem.size) {
 256			err = -EINVAL;
 257			goto fail;
 258		}
 259
 260		host1x_job_add_gather(job, bo, cmdbuf.words, cmdbuf.offset);
 261		num_cmdbufs--;
 262		user_cmdbufs++;
 263	}
 264
 265	/* copy and resolve relocations from submit */
 266	while (num_relocs--) {
 267		struct host1x_reloc *reloc;
 268		struct tegra_bo *obj;
 269
 270		err = host1x_reloc_copy_from_user(&job->relocs[num_relocs],
 271						  &user_relocs[num_relocs], drm,
 272						  file);
 273		if (err < 0)
 274			goto fail;
 275
 276		reloc = &job->relocs[num_relocs];
 277		obj = host1x_to_tegra_bo(reloc->cmdbuf.bo);
 278		refs[num_refs++] = &obj->gem;
 279
 280		/*
 281		 * The unaligned cmdbuf offset will cause an unaligned write
 282		 * during of the relocations patching, corrupting the commands
 283		 * stream.
 284		 */
 285		if (reloc->cmdbuf.offset & 3 ||
 286		    reloc->cmdbuf.offset >= obj->gem.size) {
 287			err = -EINVAL;
 288			goto fail;
 289		}
 290
 291		obj = host1x_to_tegra_bo(reloc->target.bo);
 292		refs[num_refs++] = &obj->gem;
 293
 294		if (reloc->target.offset >= obj->gem.size) {
 295			err = -EINVAL;
 296			goto fail;
 297		}
 298	}
 299
 300	if (copy_from_user(&syncpt, user_syncpt, sizeof(syncpt))) {
 301		err = -EFAULT;
 302		goto fail;
 303	}
 304
 305	/* Syncpoint ref will be dropped on job release. */
 306	sp = host1x_syncpt_get_by_id(host1x, syncpt.id);
 307	if (!sp) {
 308		err = -ENOENT;
 309		goto fail;
 310	}
 311
 312	job->is_addr_reg = context->client->ops->is_addr_reg;
 313	job->is_valid_class = context->client->ops->is_valid_class;
 314	job->syncpt_incrs = syncpt.incrs;
 315	job->syncpt = sp;
 316	job->timeout = 10000;
 317
 318	if (args->timeout && args->timeout < 10000)
 319		job->timeout = args->timeout;
 320
 321	err = host1x_job_pin(job, context->client->base.dev);
 322	if (err)
 323		goto fail;
 324
 325	err = host1x_job_submit(job);
 326	if (err) {
 327		host1x_job_unpin(job);
 328		goto fail;
 329	}
 330
 331	args->fence = job->syncpt_end;
 332
 333fail:
 334	while (num_refs--)
 335		drm_gem_object_put(refs[num_refs]);
 336
 337	kfree(refs);
 338
 339put:
 340	host1x_job_put(job);
 341	return err;
 342}
 343
 344
 345#ifdef CONFIG_DRM_TEGRA_STAGING
 346static int tegra_gem_create(struct drm_device *drm, void *data,
 347			    struct drm_file *file)
 348{
 349	struct drm_tegra_gem_create *args = data;
 350	struct tegra_bo *bo;
 351
 352	bo = tegra_bo_create_with_handle(file, drm, args->size, args->flags,
 353					 &args->handle);
 354	if (IS_ERR(bo))
 355		return PTR_ERR(bo);
 356
 357	return 0;
 358}
 359
 360static int tegra_gem_mmap(struct drm_device *drm, void *data,
 361			  struct drm_file *file)
 362{
 363	struct drm_tegra_gem_mmap *args = data;
 364	struct drm_gem_object *gem;
 365	struct tegra_bo *bo;
 366
 367	gem = drm_gem_object_lookup(file, args->handle);
 368	if (!gem)
 369		return -EINVAL;
 370
 371	bo = to_tegra_bo(gem);
 372
 373	args->offset = drm_vma_node_offset_addr(&bo->gem.vma_node);
 374
 375	drm_gem_object_put(gem);
 376
 377	return 0;
 378}
 379
 380static int tegra_syncpt_read(struct drm_device *drm, void *data,
 381			     struct drm_file *file)
 382{
 383	struct host1x *host = dev_get_drvdata(drm->dev->parent);
 384	struct drm_tegra_syncpt_read *args = data;
 385	struct host1x_syncpt *sp;
 386
 387	sp = host1x_syncpt_get_by_id_noref(host, args->id);
 388	if (!sp)
 389		return -EINVAL;
 390
 391	args->value = host1x_syncpt_read_min(sp);
 392	return 0;
 393}
 394
 395static int tegra_syncpt_incr(struct drm_device *drm, void *data,
 396			     struct drm_file *file)
 397{
 398	struct host1x *host1x = dev_get_drvdata(drm->dev->parent);
 399	struct drm_tegra_syncpt_incr *args = data;
 400	struct host1x_syncpt *sp;
 401
 402	sp = host1x_syncpt_get_by_id_noref(host1x, args->id);
 403	if (!sp)
 404		return -EINVAL;
 405
 406	return host1x_syncpt_incr(sp);
 407}
 408
 409static int tegra_syncpt_wait(struct drm_device *drm, void *data,
 410			     struct drm_file *file)
 411{
 412	struct host1x *host1x = dev_get_drvdata(drm->dev->parent);
 413	struct drm_tegra_syncpt_wait *args = data;
 414	struct host1x_syncpt *sp;
 415
 416	sp = host1x_syncpt_get_by_id_noref(host1x, args->id);
 417	if (!sp)
 418		return -EINVAL;
 419
 420	return host1x_syncpt_wait(sp, args->thresh,
 421				  msecs_to_jiffies(args->timeout),
 422				  &args->value);
 423}
 424
 425static int tegra_client_open(struct tegra_drm_file *fpriv,
 426			     struct tegra_drm_client *client,
 427			     struct tegra_drm_context *context)
 428{
 429	int err;
 430
 431	err = client->ops->open_channel(client, context);
 432	if (err < 0)
 433		return err;
 434
 435	err = idr_alloc(&fpriv->contexts, context, 1, 0, GFP_KERNEL);
 436	if (err < 0) {
 437		client->ops->close_channel(context);
 438		return err;
 439	}
 440
 441	context->client = client;
 442	context->id = err;
 443
 444	return 0;
 445}
 446
 447static int tegra_open_channel(struct drm_device *drm, void *data,
 448			      struct drm_file *file)
 449{
 450	struct tegra_drm_file *fpriv = file->driver_priv;
 451	struct tegra_drm *tegra = drm->dev_private;
 452	struct drm_tegra_open_channel *args = data;
 453	struct tegra_drm_context *context;
 454	struct tegra_drm_client *client;
 455	int err = -ENODEV;
 456
 457	context = kzalloc(sizeof(*context), GFP_KERNEL);
 458	if (!context)
 459		return -ENOMEM;
 460
 461	mutex_lock(&fpriv->lock);
 462
 463	list_for_each_entry(client, &tegra->clients, list)
 464		if (client->base.class == args->client) {
 465			err = tegra_client_open(fpriv, client, context);
 466			if (err < 0)
 467				break;
 468
 469			args->context = context->id;
 470			break;
 471		}
 472
 473	if (err < 0)
 474		kfree(context);
 475
 476	mutex_unlock(&fpriv->lock);
 477	return err;
 478}
 479
 480static int tegra_close_channel(struct drm_device *drm, void *data,
 481			       struct drm_file *file)
 482{
 483	struct tegra_drm_file *fpriv = file->driver_priv;
 484	struct drm_tegra_close_channel *args = data;
 485	struct tegra_drm_context *context;
 486	int err = 0;
 487
 488	mutex_lock(&fpriv->lock);
 489
 490	context = idr_find(&fpriv->contexts, args->context);
 491	if (!context) {
 492		err = -EINVAL;
 493		goto unlock;
 494	}
 495
 496	idr_remove(&fpriv->contexts, context->id);
 497	tegra_drm_context_free(context);
 498
 499unlock:
 500	mutex_unlock(&fpriv->lock);
 501	return err;
 502}
 503
 504static int tegra_get_syncpt(struct drm_device *drm, void *data,
 505			    struct drm_file *file)
 506{
 507	struct tegra_drm_file *fpriv = file->driver_priv;
 508	struct drm_tegra_get_syncpt *args = data;
 509	struct tegra_drm_context *context;
 510	struct host1x_syncpt *syncpt;
 511	int err = 0;
 512
 513	mutex_lock(&fpriv->lock);
 514
 515	context = idr_find(&fpriv->contexts, args->context);
 516	if (!context) {
 517		err = -ENODEV;
 518		goto unlock;
 519	}
 520
 521	if (args->index >= context->client->base.num_syncpts) {
 522		err = -EINVAL;
 523		goto unlock;
 524	}
 525
 526	syncpt = context->client->base.syncpts[args->index];
 527	args->id = host1x_syncpt_id(syncpt);
 528
 529unlock:
 530	mutex_unlock(&fpriv->lock);
 531	return err;
 532}
 533
 534static int tegra_submit(struct drm_device *drm, void *data,
 535			struct drm_file *file)
 536{
 537	struct tegra_drm_file *fpriv = file->driver_priv;
 538	struct drm_tegra_submit *args = data;
 539	struct tegra_drm_context *context;
 540	int err;
 541
 542	mutex_lock(&fpriv->lock);
 543
 544	context = idr_find(&fpriv->contexts, args->context);
 545	if (!context) {
 546		err = -ENODEV;
 547		goto unlock;
 548	}
 549
 550	err = context->client->ops->submit(context, args, drm, file);
 551
 552unlock:
 553	mutex_unlock(&fpriv->lock);
 554	return err;
 555}
 556
 557static int tegra_get_syncpt_base(struct drm_device *drm, void *data,
 558				 struct drm_file *file)
 559{
 560	struct tegra_drm_file *fpriv = file->driver_priv;
 561	struct drm_tegra_get_syncpt_base *args = data;
 562	struct tegra_drm_context *context;
 563	struct host1x_syncpt_base *base;
 564	struct host1x_syncpt *syncpt;
 565	int err = 0;
 566
 567	mutex_lock(&fpriv->lock);
 568
 569	context = idr_find(&fpriv->contexts, args->context);
 570	if (!context) {
 571		err = -ENODEV;
 572		goto unlock;
 573	}
 574
 575	if (args->syncpt >= context->client->base.num_syncpts) {
 576		err = -EINVAL;
 577		goto unlock;
 578	}
 579
 580	syncpt = context->client->base.syncpts[args->syncpt];
 581
 582	base = host1x_syncpt_get_base(syncpt);
 583	if (!base) {
 584		err = -ENXIO;
 585		goto unlock;
 586	}
 587
 588	args->id = host1x_syncpt_base_id(base);
 589
 590unlock:
 591	mutex_unlock(&fpriv->lock);
 592	return err;
 593}
 594
 595static int tegra_gem_set_tiling(struct drm_device *drm, void *data,
 596				struct drm_file *file)
 597{
 598	struct drm_tegra_gem_set_tiling *args = data;
 599	enum tegra_bo_tiling_mode mode;
 600	struct drm_gem_object *gem;
 601	unsigned long value = 0;
 602	struct tegra_bo *bo;
 603
 604	switch (args->mode) {
 605	case DRM_TEGRA_GEM_TILING_MODE_PITCH:
 606		mode = TEGRA_BO_TILING_MODE_PITCH;
 607
 608		if (args->value != 0)
 609			return -EINVAL;
 610
 611		break;
 612
 613	case DRM_TEGRA_GEM_TILING_MODE_TILED:
 614		mode = TEGRA_BO_TILING_MODE_TILED;
 615
 616		if (args->value != 0)
 617			return -EINVAL;
 618
 619		break;
 620
 621	case DRM_TEGRA_GEM_TILING_MODE_BLOCK:
 622		mode = TEGRA_BO_TILING_MODE_BLOCK;
 623
 624		if (args->value > 5)
 625			return -EINVAL;
 626
 627		value = args->value;
 628		break;
 629
 630	default:
 631		return -EINVAL;
 632	}
 633
 634	gem = drm_gem_object_lookup(file, args->handle);
 635	if (!gem)
 636		return -ENOENT;
 637
 638	bo = to_tegra_bo(gem);
 639
 640	bo->tiling.mode = mode;
 641	bo->tiling.value = value;
 642
 643	drm_gem_object_put(gem);
 644
 645	return 0;
 646}
 647
 648static int tegra_gem_get_tiling(struct drm_device *drm, void *data,
 649				struct drm_file *file)
 650{
 651	struct drm_tegra_gem_get_tiling *args = data;
 652	struct drm_gem_object *gem;
 653	struct tegra_bo *bo;
 654	int err = 0;
 655
 656	gem = drm_gem_object_lookup(file, args->handle);
 657	if (!gem)
 658		return -ENOENT;
 659
 660	bo = to_tegra_bo(gem);
 661
 662	switch (bo->tiling.mode) {
 663	case TEGRA_BO_TILING_MODE_PITCH:
 664		args->mode = DRM_TEGRA_GEM_TILING_MODE_PITCH;
 665		args->value = 0;
 666		break;
 667
 668	case TEGRA_BO_TILING_MODE_TILED:
 669		args->mode = DRM_TEGRA_GEM_TILING_MODE_TILED;
 670		args->value = 0;
 671		break;
 672
 673	case TEGRA_BO_TILING_MODE_BLOCK:
 674		args->mode = DRM_TEGRA_GEM_TILING_MODE_BLOCK;
 675		args->value = bo->tiling.value;
 676		break;
 677
 678	default:
 679		err = -EINVAL;
 680		break;
 681	}
 682
 683	drm_gem_object_put(gem);
 684
 685	return err;
 686}
 687
 688static int tegra_gem_set_flags(struct drm_device *drm, void *data,
 689			       struct drm_file *file)
 690{
 691	struct drm_tegra_gem_set_flags *args = data;
 692	struct drm_gem_object *gem;
 693	struct tegra_bo *bo;
 694
 695	if (args->flags & ~DRM_TEGRA_GEM_FLAGS)
 696		return -EINVAL;
 697
 698	gem = drm_gem_object_lookup(file, args->handle);
 699	if (!gem)
 700		return -ENOENT;
 701
 702	bo = to_tegra_bo(gem);
 703	bo->flags = 0;
 704
 705	if (args->flags & DRM_TEGRA_GEM_BOTTOM_UP)
 706		bo->flags |= TEGRA_BO_BOTTOM_UP;
 707
 708	drm_gem_object_put(gem);
 709
 710	return 0;
 711}
 712
 713static int tegra_gem_get_flags(struct drm_device *drm, void *data,
 714			       struct drm_file *file)
 715{
 716	struct drm_tegra_gem_get_flags *args = data;
 717	struct drm_gem_object *gem;
 718	struct tegra_bo *bo;
 719
 720	gem = drm_gem_object_lookup(file, args->handle);
 721	if (!gem)
 722		return -ENOENT;
 723
 724	bo = to_tegra_bo(gem);
 725	args->flags = 0;
 726
 727	if (bo->flags & TEGRA_BO_BOTTOM_UP)
 728		args->flags |= DRM_TEGRA_GEM_BOTTOM_UP;
 729
 730	drm_gem_object_put(gem);
 731
 732	return 0;
 733}
 734#endif
 735
 736static const struct drm_ioctl_desc tegra_drm_ioctls[] = {
 737#ifdef CONFIG_DRM_TEGRA_STAGING
 738	DRM_IOCTL_DEF_DRV(TEGRA_GEM_CREATE, tegra_gem_create,
 739			  DRM_RENDER_ALLOW),
 740	DRM_IOCTL_DEF_DRV(TEGRA_GEM_MMAP, tegra_gem_mmap,
 741			  DRM_RENDER_ALLOW),
 742	DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_READ, tegra_syncpt_read,
 743			  DRM_RENDER_ALLOW),
 744	DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_INCR, tegra_syncpt_incr,
 745			  DRM_RENDER_ALLOW),
 746	DRM_IOCTL_DEF_DRV(TEGRA_SYNCPT_WAIT, tegra_syncpt_wait,
 747			  DRM_RENDER_ALLOW),
 748	DRM_IOCTL_DEF_DRV(TEGRA_OPEN_CHANNEL, tegra_open_channel,
 749			  DRM_RENDER_ALLOW),
 750	DRM_IOCTL_DEF_DRV(TEGRA_CLOSE_CHANNEL, tegra_close_channel,
 751			  DRM_RENDER_ALLOW),
 752	DRM_IOCTL_DEF_DRV(TEGRA_GET_SYNCPT, tegra_get_syncpt,
 753			  DRM_RENDER_ALLOW),
 754	DRM_IOCTL_DEF_DRV(TEGRA_SUBMIT, tegra_submit,
 755			  DRM_RENDER_ALLOW),
 756	DRM_IOCTL_DEF_DRV(TEGRA_GET_SYNCPT_BASE, tegra_get_syncpt_base,
 757			  DRM_RENDER_ALLOW),
 758	DRM_IOCTL_DEF_DRV(TEGRA_GEM_SET_TILING, tegra_gem_set_tiling,
 759			  DRM_RENDER_ALLOW),
 760	DRM_IOCTL_DEF_DRV(TEGRA_GEM_GET_TILING, tegra_gem_get_tiling,
 761			  DRM_RENDER_ALLOW),
 762	DRM_IOCTL_DEF_DRV(TEGRA_GEM_SET_FLAGS, tegra_gem_set_flags,
 763			  DRM_RENDER_ALLOW),
 764	DRM_IOCTL_DEF_DRV(TEGRA_GEM_GET_FLAGS, tegra_gem_get_flags,
 765			  DRM_RENDER_ALLOW),
 766#endif
 767};
 768
 769static const struct file_operations tegra_drm_fops = {
 770	.owner = THIS_MODULE,
 771	.open = drm_open,
 772	.release = drm_release,
 773	.unlocked_ioctl = drm_ioctl,
 774	.mmap = tegra_drm_mmap,
 775	.poll = drm_poll,
 776	.read = drm_read,
 777	.compat_ioctl = drm_compat_ioctl,
 778	.llseek = noop_llseek,
 779};
 780
 781static int tegra_drm_context_cleanup(int id, void *p, void *data)
 782{
 783	struct tegra_drm_context *context = p;
 784
 785	tegra_drm_context_free(context);
 786
 787	return 0;
 788}
 789
 790static void tegra_drm_postclose(struct drm_device *drm, struct drm_file *file)
 791{
 792	struct tegra_drm_file *fpriv = file->driver_priv;
 793
 794	mutex_lock(&fpriv->lock);
 795	idr_for_each(&fpriv->contexts, tegra_drm_context_cleanup, NULL);
 796	mutex_unlock(&fpriv->lock);
 797
 798	idr_destroy(&fpriv->contexts);
 799	mutex_destroy(&fpriv->lock);
 800	kfree(fpriv);
 801}
 802
 803#ifdef CONFIG_DEBUG_FS
 804static int tegra_debugfs_framebuffers(struct seq_file *s, void *data)
 805{
 806	struct drm_info_node *node = (struct drm_info_node *)s->private;
 807	struct drm_device *drm = node->minor->dev;
 808	struct drm_framebuffer *fb;
 809
 810	mutex_lock(&drm->mode_config.fb_lock);
 811
 812	list_for_each_entry(fb, &drm->mode_config.fb_list, head) {
 813		seq_printf(s, "%3d: user size: %d x %d, depth %d, %d bpp, refcount %d\n",
 814			   fb->base.id, fb->width, fb->height,
 815			   fb->format->depth,
 816			   fb->format->cpp[0] * 8,
 817			   drm_framebuffer_read_refcount(fb));
 818	}
 819
 820	mutex_unlock(&drm->mode_config.fb_lock);
 821
 822	return 0;
 823}
 824
 825static int tegra_debugfs_iova(struct seq_file *s, void *data)
 826{
 827	struct drm_info_node *node = (struct drm_info_node *)s->private;
 828	struct drm_device *drm = node->minor->dev;
 829	struct tegra_drm *tegra = drm->dev_private;
 830	struct drm_printer p = drm_seq_file_printer(s);
 831
 832	if (tegra->domain) {
 833		mutex_lock(&tegra->mm_lock);
 834		drm_mm_print(&tegra->mm, &p);
 835		mutex_unlock(&tegra->mm_lock);
 836	}
 837
 838	return 0;
 839}
 840
 841static struct drm_info_list tegra_debugfs_list[] = {
 842	{ "framebuffers", tegra_debugfs_framebuffers, 0 },
 843	{ "iova", tegra_debugfs_iova, 0 },
 844};
 845
 846static void tegra_debugfs_init(struct drm_minor *minor)
 847{
 848	drm_debugfs_create_files(tegra_debugfs_list,
 849				 ARRAY_SIZE(tegra_debugfs_list),
 850				 minor->debugfs_root, minor);
 851}
 852#endif
 853
 854static const struct drm_driver tegra_drm_driver = {
 855	.driver_features = DRIVER_MODESET | DRIVER_GEM |
 856			   DRIVER_ATOMIC | DRIVER_RENDER,
 857	.open = tegra_drm_open,
 858	.postclose = tegra_drm_postclose,
 859	.lastclose = drm_fb_helper_lastclose,
 860
 861#if defined(CONFIG_DEBUG_FS)
 862	.debugfs_init = tegra_debugfs_init,
 863#endif
 864
 865	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 866	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 867	.gem_prime_import = tegra_gem_prime_import,
 868
 869	.dumb_create = tegra_bo_dumb_create,
 870
 871	.ioctls = tegra_drm_ioctls,
 872	.num_ioctls = ARRAY_SIZE(tegra_drm_ioctls),
 873	.fops = &tegra_drm_fops,
 874
 875	.name = DRIVER_NAME,
 876	.desc = DRIVER_DESC,
 877	.date = DRIVER_DATE,
 878	.major = DRIVER_MAJOR,
 879	.minor = DRIVER_MINOR,
 880	.patchlevel = DRIVER_PATCHLEVEL,
 881};
 882
 883int tegra_drm_register_client(struct tegra_drm *tegra,
 884			      struct tegra_drm_client *client)
 885{
 886	mutex_lock(&tegra->clients_lock);
 887	list_add_tail(&client->list, &tegra->clients);
 888	client->drm = tegra;
 889	mutex_unlock(&tegra->clients_lock);
 890
 891	return 0;
 892}
 893
 894int tegra_drm_unregister_client(struct tegra_drm *tegra,
 895				struct tegra_drm_client *client)
 896{
 897	mutex_lock(&tegra->clients_lock);
 898	list_del_init(&client->list);
 899	client->drm = NULL;
 900	mutex_unlock(&tegra->clients_lock);
 901
 902	return 0;
 903}
 904
 905int host1x_client_iommu_attach(struct host1x_client *client)
 906{
 907	struct iommu_domain *domain = iommu_get_domain_for_dev(client->dev);
 908	struct drm_device *drm = dev_get_drvdata(client->host);
 909	struct tegra_drm *tegra = drm->dev_private;
 910	struct iommu_group *group = NULL;
 911	int err;
 912
 913	/*
 914	 * If the host1x client is already attached to an IOMMU domain that is
 915	 * not the shared IOMMU domain, don't try to attach it to a different
 916	 * domain. This allows using the IOMMU-backed DMA API.
 917	 */
 918	if (domain && domain != tegra->domain)
 919		return 0;
 920
 921	if (tegra->domain) {
 922		group = iommu_group_get(client->dev);
 923		if (!group)
 924			return -ENODEV;
 925
 926		if (domain != tegra->domain) {
 927			err = iommu_attach_group(tegra->domain, group);
 928			if (err < 0) {
 929				iommu_group_put(group);
 930				return err;
 931			}
 932		}
 933
 934		tegra->use_explicit_iommu = true;
 935	}
 936
 937	client->group = group;
 938
 939	return 0;
 940}
 941
 942void host1x_client_iommu_detach(struct host1x_client *client)
 943{
 944	struct drm_device *drm = dev_get_drvdata(client->host);
 945	struct tegra_drm *tegra = drm->dev_private;
 946	struct iommu_domain *domain;
 947
 948	if (client->group) {
 949		/*
 950		 * Devices that are part of the same group may no longer be
 951		 * attached to a domain at this point because their group may
 952		 * have been detached by an earlier client.
 953		 */
 954		domain = iommu_get_domain_for_dev(client->dev);
 955		if (domain)
 956			iommu_detach_group(tegra->domain, client->group);
 957
 958		iommu_group_put(client->group);
 959		client->group = NULL;
 960	}
 961}
 962
 963void *tegra_drm_alloc(struct tegra_drm *tegra, size_t size, dma_addr_t *dma)
 964{
 965	struct iova *alloc;
 966	void *virt;
 967	gfp_t gfp;
 968	int err;
 969
 970	if (tegra->domain)
 971		size = iova_align(&tegra->carveout.domain, size);
 972	else
 973		size = PAGE_ALIGN(size);
 974
 975	gfp = GFP_KERNEL | __GFP_ZERO;
 976	if (!tegra->domain) {
 977		/*
 978		 * Many units only support 32-bit addresses, even on 64-bit
 979		 * SoCs. If there is no IOMMU to translate into a 32-bit IO
 980		 * virtual address space, force allocations to be in the
 981		 * lower 32-bit range.
 982		 */
 983		gfp |= GFP_DMA;
 984	}
 985
 986	virt = (void *)__get_free_pages(gfp, get_order(size));
 987	if (!virt)
 988		return ERR_PTR(-ENOMEM);
 989
 990	if (!tegra->domain) {
 991		/*
 992		 * If IOMMU is disabled, devices address physical memory
 993		 * directly.
 994		 */
 995		*dma = virt_to_phys(virt);
 996		return virt;
 997	}
 998
 999	alloc = alloc_iova(&tegra->carveout.domain,
1000			   size >> tegra->carveout.shift,
1001			   tegra->carveout.limit, true);
1002	if (!alloc) {
1003		err = -EBUSY;
1004		goto free_pages;
1005	}
1006
1007	*dma = iova_dma_addr(&tegra->carveout.domain, alloc);
1008	err = iommu_map(tegra->domain, *dma, virt_to_phys(virt),
1009			size, IOMMU_READ | IOMMU_WRITE);
1010	if (err < 0)
1011		goto free_iova;
1012
1013	return virt;
1014
1015free_iova:
1016	__free_iova(&tegra->carveout.domain, alloc);
1017free_pages:
1018	free_pages((unsigned long)virt, get_order(size));
1019
1020	return ERR_PTR(err);
1021}
1022
1023void tegra_drm_free(struct tegra_drm *tegra, size_t size, void *virt,
1024		    dma_addr_t dma)
1025{
1026	if (tegra->domain)
1027		size = iova_align(&tegra->carveout.domain, size);
1028	else
1029		size = PAGE_ALIGN(size);
1030
1031	if (tegra->domain) {
1032		iommu_unmap(tegra->domain, dma, size);
1033		free_iova(&tegra->carveout.domain,
1034			  iova_pfn(&tegra->carveout.domain, dma));
1035	}
1036
1037	free_pages((unsigned long)virt, get_order(size));
1038}
1039
1040static bool host1x_drm_wants_iommu(struct host1x_device *dev)
1041{
1042	struct host1x *host1x = dev_get_drvdata(dev->dev.parent);
1043	struct iommu_domain *domain;
1044
1045	/*
1046	 * If the Tegra DRM clients are backed by an IOMMU, push buffers are
1047	 * likely to be allocated beyond the 32-bit boundary if sufficient
1048	 * system memory is available. This is problematic on earlier Tegra
1049	 * generations where host1x supports a maximum of 32 address bits in
1050	 * the GATHER opcode. In this case, unless host1x is behind an IOMMU
1051	 * as well it won't be able to process buffers allocated beyond the
1052	 * 32-bit boundary.
1053	 *
1054	 * The DMA API will use bounce buffers in this case, so that could
1055	 * perhaps still be made to work, even if less efficient, but there
1056	 * is another catch: in order to perform cache maintenance on pages
1057	 * allocated for discontiguous buffers we need to map and unmap the
1058	 * SG table representing these buffers. This is fine for something
1059	 * small like a push buffer, but it exhausts the bounce buffer pool
1060	 * (typically on the order of a few MiB) for framebuffers (many MiB
1061	 * for any modern resolution).
1062	 *
1063	 * Work around this by making sure that Tegra DRM clients only use
1064	 * an IOMMU if the parent host1x also uses an IOMMU.
1065	 *
1066	 * Note that there's still a small gap here that we don't cover: if
1067	 * the DMA API is backed by an IOMMU there's no way to control which
1068	 * device is attached to an IOMMU and which isn't, except via wiring
1069	 * up the device tree appropriately. This is considered an problem
1070	 * of integration, so care must be taken for the DT to be consistent.
1071	 */
1072	domain = iommu_get_domain_for_dev(dev->dev.parent);
1073
1074	/*
1075	 * Tegra20 and Tegra30 don't support addressing memory beyond the
1076	 * 32-bit boundary, so the regular GATHER opcodes will always be
1077	 * sufficient and whether or not the host1x is attached to an IOMMU
1078	 * doesn't matter.
1079	 */
1080	if (!domain && host1x_get_dma_mask(host1x) <= DMA_BIT_MASK(32))
1081		return true;
1082
1083	return domain != NULL;
1084}
1085
1086static int host1x_drm_probe(struct host1x_device *dev)
1087{
1088	struct tegra_drm *tegra;
1089	struct drm_device *drm;
1090	int err;
1091
1092	drm = drm_dev_alloc(&tegra_drm_driver, &dev->dev);
1093	if (IS_ERR(drm))
1094		return PTR_ERR(drm);
1095
1096	tegra = kzalloc(sizeof(*tegra), GFP_KERNEL);
1097	if (!tegra) {
1098		err = -ENOMEM;
1099		goto put;
1100	}
1101
1102	if (host1x_drm_wants_iommu(dev) && iommu_present(&platform_bus_type)) {
1103		tegra->domain = iommu_domain_alloc(&platform_bus_type);
1104		if (!tegra->domain) {
1105			err = -ENOMEM;
1106			goto free;
1107		}
1108
1109		err = iova_cache_get();
1110		if (err < 0)
1111			goto domain;
1112	}
1113
1114	mutex_init(&tegra->clients_lock);
1115	INIT_LIST_HEAD(&tegra->clients);
1116
1117	dev_set_drvdata(&dev->dev, drm);
1118	drm->dev_private = tegra;
1119	tegra->drm = drm;
1120
1121	drm_mode_config_init(drm);
1122
1123	drm->mode_config.min_width = 0;
1124	drm->mode_config.min_height = 0;
1125	drm->mode_config.max_width = 0;
1126	drm->mode_config.max_height = 0;
1127
1128	drm->mode_config.normalize_zpos = true;
1129
1130	drm->mode_config.funcs = &tegra_drm_mode_config_funcs;
1131	drm->mode_config.helper_private = &tegra_drm_mode_config_helpers;
1132
1133	err = tegra_drm_fb_prepare(drm);
1134	if (err < 0)
1135		goto config;
1136
1137	drm_kms_helper_poll_init(drm);
1138
1139	err = host1x_device_init(dev);
1140	if (err < 0)
1141		goto fbdev;
1142
1143	/*
1144	 * Now that all display controller have been initialized, the maximum
1145	 * supported resolution is known and the bitmask for horizontal and
1146	 * vertical bitfields can be computed.
1147	 */
1148	tegra->hmask = drm->mode_config.max_width - 1;
1149	tegra->vmask = drm->mode_config.max_height - 1;
1150
1151	if (tegra->use_explicit_iommu) {
1152		u64 carveout_start, carveout_end, gem_start, gem_end;
1153		u64 dma_mask = dma_get_mask(&dev->dev);
1154		dma_addr_t start, end;
1155		unsigned long order;
1156
1157		start = tegra->domain->geometry.aperture_start & dma_mask;
1158		end = tegra->domain->geometry.aperture_end & dma_mask;
1159
1160		gem_start = start;
1161		gem_end = end - CARVEOUT_SZ;
1162		carveout_start = gem_end + 1;
1163		carveout_end = end;
1164
1165		order = __ffs(tegra->domain->pgsize_bitmap);
1166		init_iova_domain(&tegra->carveout.domain, 1UL << order,
1167				 carveout_start >> order);
1168
1169		tegra->carveout.shift = iova_shift(&tegra->carveout.domain);
1170		tegra->carveout.limit = carveout_end >> tegra->carveout.shift;
1171
1172		drm_mm_init(&tegra->mm, gem_start, gem_end - gem_start + 1);
1173		mutex_init(&tegra->mm_lock);
1174
1175		DRM_DEBUG_DRIVER("IOMMU apertures:\n");
1176		DRM_DEBUG_DRIVER("  GEM: %#llx-%#llx\n", gem_start, gem_end);
1177		DRM_DEBUG_DRIVER("  Carveout: %#llx-%#llx\n", carveout_start,
1178				 carveout_end);
1179	} else if (tegra->domain) {
1180		iommu_domain_free(tegra->domain);
1181		tegra->domain = NULL;
1182		iova_cache_put();
1183	}
1184
1185	if (tegra->hub) {
1186		err = tegra_display_hub_prepare(tegra->hub);
1187		if (err < 0)
1188			goto device;
1189	}
1190
1191	/*
1192	 * We don't use the drm_irq_install() helpers provided by the DRM
1193	 * core, so we need to set this manually in order to allow the
1194	 * DRM_IOCTL_WAIT_VBLANK to operate correctly.
1195	 */
1196	drm->irq_enabled = true;
1197
1198	/* syncpoints are used for full 32-bit hardware VBLANK counters */
1199	drm->max_vblank_count = 0xffffffff;
1200
1201	err = drm_vblank_init(drm, drm->mode_config.num_crtc);
1202	if (err < 0)
1203		goto hub;
1204
1205	drm_mode_config_reset(drm);
1206
1207	err = drm_aperture_remove_framebuffers(false, "tegradrmfb");
1208	if (err < 0)
1209		goto hub;
1210
1211	err = tegra_drm_fb_init(drm);
1212	if (err < 0)
1213		goto hub;
1214
1215	err = drm_dev_register(drm, 0);
1216	if (err < 0)
1217		goto fb;
1218
1219	return 0;
1220
1221fb:
1222	tegra_drm_fb_exit(drm);
1223hub:
1224	if (tegra->hub)
1225		tegra_display_hub_cleanup(tegra->hub);
1226device:
1227	if (tegra->domain) {
1228		mutex_destroy(&tegra->mm_lock);
1229		drm_mm_takedown(&tegra->mm);
1230		put_iova_domain(&tegra->carveout.domain);
1231		iova_cache_put();
1232	}
1233
1234	host1x_device_exit(dev);
1235fbdev:
1236	drm_kms_helper_poll_fini(drm);
1237	tegra_drm_fb_free(drm);
1238config:
1239	drm_mode_config_cleanup(drm);
1240domain:
1241	if (tegra->domain)
1242		iommu_domain_free(tegra->domain);
1243free:
1244	kfree(tegra);
1245put:
1246	drm_dev_put(drm);
1247	return err;
1248}
1249
1250static int host1x_drm_remove(struct host1x_device *dev)
1251{
1252	struct drm_device *drm = dev_get_drvdata(&dev->dev);
1253	struct tegra_drm *tegra = drm->dev_private;
1254	int err;
1255
1256	drm_dev_unregister(drm);
1257
1258	drm_kms_helper_poll_fini(drm);
1259	tegra_drm_fb_exit(drm);
1260	drm_atomic_helper_shutdown(drm);
1261	drm_mode_config_cleanup(drm);
1262
1263	if (tegra->hub)
1264		tegra_display_hub_cleanup(tegra->hub);
1265
1266	err = host1x_device_exit(dev);
1267	if (err < 0)
1268		dev_err(&dev->dev, "host1x device cleanup failed: %d\n", err);
1269
1270	if (tegra->domain) {
1271		mutex_destroy(&tegra->mm_lock);
1272		drm_mm_takedown(&tegra->mm);
1273		put_iova_domain(&tegra->carveout.domain);
1274		iova_cache_put();
1275		iommu_domain_free(tegra->domain);
1276	}
1277
1278	kfree(tegra);
1279	drm_dev_put(drm);
1280
1281	return 0;
1282}
1283
1284#ifdef CONFIG_PM_SLEEP
1285static int host1x_drm_suspend(struct device *dev)
1286{
1287	struct drm_device *drm = dev_get_drvdata(dev);
1288
1289	return drm_mode_config_helper_suspend(drm);
1290}
1291
1292static int host1x_drm_resume(struct device *dev)
1293{
1294	struct drm_device *drm = dev_get_drvdata(dev);
1295
1296	return drm_mode_config_helper_resume(drm);
1297}
1298#endif
1299
1300static SIMPLE_DEV_PM_OPS(host1x_drm_pm_ops, host1x_drm_suspend,
1301			 host1x_drm_resume);
1302
1303static const struct of_device_id host1x_drm_subdevs[] = {
1304	{ .compatible = "nvidia,tegra20-dc", },
1305	{ .compatible = "nvidia,tegra20-hdmi", },
1306	{ .compatible = "nvidia,tegra20-gr2d", },
1307	{ .compatible = "nvidia,tegra20-gr3d", },
1308	{ .compatible = "nvidia,tegra30-dc", },
1309	{ .compatible = "nvidia,tegra30-hdmi", },
1310	{ .compatible = "nvidia,tegra30-gr2d", },
1311	{ .compatible = "nvidia,tegra30-gr3d", },
1312	{ .compatible = "nvidia,tegra114-dc", },
1313	{ .compatible = "nvidia,tegra114-dsi", },
1314	{ .compatible = "nvidia,tegra114-hdmi", },
1315	{ .compatible = "nvidia,tegra114-gr2d", },
1316	{ .compatible = "nvidia,tegra114-gr3d", },
1317	{ .compatible = "nvidia,tegra124-dc", },
1318	{ .compatible = "nvidia,tegra124-sor", },
1319	{ .compatible = "nvidia,tegra124-hdmi", },
1320	{ .compatible = "nvidia,tegra124-dsi", },
1321	{ .compatible = "nvidia,tegra124-vic", },
1322	{ .compatible = "nvidia,tegra132-dsi", },
1323	{ .compatible = "nvidia,tegra210-dc", },
1324	{ .compatible = "nvidia,tegra210-dsi", },
1325	{ .compatible = "nvidia,tegra210-sor", },
1326	{ .compatible = "nvidia,tegra210-sor1", },
1327	{ .compatible = "nvidia,tegra210-vic", },
1328	{ .compatible = "nvidia,tegra186-display", },
1329	{ .compatible = "nvidia,tegra186-dc", },
1330	{ .compatible = "nvidia,tegra186-sor", },
1331	{ .compatible = "nvidia,tegra186-sor1", },
1332	{ .compatible = "nvidia,tegra186-vic", },
1333	{ .compatible = "nvidia,tegra194-display", },
1334	{ .compatible = "nvidia,tegra194-dc", },
1335	{ .compatible = "nvidia,tegra194-sor", },
1336	{ .compatible = "nvidia,tegra194-vic", },
1337	{ /* sentinel */ }
1338};
1339
1340static struct host1x_driver host1x_drm_driver = {
1341	.driver = {
1342		.name = "drm",
1343		.pm = &host1x_drm_pm_ops,
1344	},
1345	.probe = host1x_drm_probe,
1346	.remove = host1x_drm_remove,
1347	.subdevs = host1x_drm_subdevs,
1348};
1349
1350static struct platform_driver * const drivers[] = {
1351	&tegra_display_hub_driver,
1352	&tegra_dc_driver,
1353	&tegra_hdmi_driver,
1354	&tegra_dsi_driver,
1355	&tegra_dpaux_driver,
1356	&tegra_sor_driver,
1357	&tegra_gr2d_driver,
1358	&tegra_gr3d_driver,
1359	&tegra_vic_driver,
1360};
1361
1362static int __init host1x_drm_init(void)
1363{
1364	int err;
1365
1366	err = host1x_driver_register(&host1x_drm_driver);
1367	if (err < 0)
1368		return err;
1369
1370	err = platform_register_drivers(drivers, ARRAY_SIZE(drivers));
1371	if (err < 0)
1372		goto unregister_host1x;
1373
1374	return 0;
1375
1376unregister_host1x:
1377	host1x_driver_unregister(&host1x_drm_driver);
1378	return err;
1379}
1380module_init(host1x_drm_init);
1381
1382static void __exit host1x_drm_exit(void)
1383{
1384	platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
1385	host1x_driver_unregister(&host1x_drm_driver);
1386}
1387module_exit(host1x_drm_exit);
1388
1389MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>");
1390MODULE_DESCRIPTION("NVIDIA Tegra DRM driver");
1391MODULE_LICENSE("GPL v2");